Self-inking stamp.



J. ALSENZ.

SELF INKI'NG STAMP.

APPLICATION FILED Nov. 3o. I9I4.

I ,279, 95 9 Patnted Sept. 24, 1918.

A illlllllllll j 4 4 nu@ nto@ 23513 Mom/ww UNITED .STATES PATENT oEEroE.

JULIUS ALSENZ, OF PALISADES PARK, NEW JERSEY, ASSIGNOR TO THE CUSHMN & DENISON 1VIANUFAC'IURINGr CO.,"OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

SELF-INKING STAMP.

Specification of Letters Patent.

' Patented Sept. 24, 1918.

Application filed November 30, 1914. Serial No. 874,704.

'To all whom t may concern:

Be it known that I, J ULIUS ALsENz, a citizen of the United States of America, residing in Palisades Park, county of Bergen, and State of New- Jersey, have invented certain new and useful Improvements in Self-Inking Stamps, of which the following is a specification. y

This invention relates to self-inking hand stamps and has particular reference to an improved inling mechanism.

The objects of invention include a simple and positively acting mechanism for causing the movements of the ink distributing means relatively to the printing characters; and further includes the elimination of cams and camming surfaces for the actuation of the inking mechanism.

Referring to the drawings:

Figure 1 is a frontelevation of the stamp:

Fig. 2, a sectional elevation taken on the line 2 2 of Fig. 1:

Fig. 3, a sectional elevation taken on the line 8 3 of Fig. 4:

Fig. 4, a sectional elevation taken on the' line 4 4 of Fig. 3: and

Fig. 5, a section taken on the line 5 5 of Fig. 4.

The main casing 10 has located within it the printing frame 11 which is equipped with the usual handle 12 by which it may be depressed, and a spring 13 normally holding it elevated. The frame 11 carries the printing characters mounted in any suitable way. In the present instance the characters are placed upon drums 14, 14, the drums being mounted upon a shaft 15 attached to frame 11 by screws 16, 16. The drums may be rotated about the shaft 15 and suitable spring pawls, as indicated at 17 in Fig. 2, are provided, one for each drum, to prevent their accidental movement and to maintain the alinement of the printing characters. The mechanism thus far described, and its operation, are well known in the art.

The inking means is illustrated in the form of an ink pad 18, and as shown in Figs. 1 and 2, this pad rests normally against the printing characters to supply them with ink, and when the printing frame is depressed in the operation of printing, the pad is swung out of the way to a position indicated by dotted lines in Fig. 4. The mechanism actuating this pad is shown in the form of racks 20, 20, one attached to each side of the printslots and camming, or compound lever move-l ments, are rendered unnecessary, and that the simple action of the rack upon .the pinion is all that is necessary to secure the desired movement. The improved mechanism is not only more simple, more positive, and less liable to get out of order; but it also works with much less friction and wear, as there are no camming or guiding surfaces bearing upon the arms of the ink pad to constrain its motion, such surfaces causing considerable friction and wear owing to the necessary high speed of movement of the ink pad.

It is further desirable that the ink pad be withdrawn from contact with the type as soon as the depression of the handle begins. This Vis provided for in the construction illustrated by giving to the pinions an eccenis, at an angle to the line of movement of the frame 1l. This construction secures an eX- ceedingly rapid movement of the pinions and the ink pad during the first part of the downward movement of the frame and the racks; the movement of the pinions, however, decreasing in speedv and extent as the radius of the pitch line of the pinions increases. The slant of the rack is provided to compensate for the eccentric pitch line of the -pinions and it is obvious that in the arrangement shown, the pitch line of the racks is always tangent to the pitch line of the pinions at the point where the racks and pinions are in mesh.

The racks are accurately positioned in assembling by means of small stamped up bosses 24, 24 forming dowels which fit into slots 25, 25 stamped in the frame l1. The racks serve also as washers for the screws 16, 16, the screws holding both the racks and the shaft 15 firmly to the frame 11.

is that the decreasing range of moif'ement of the ink pad `outward due to kthe .eccentric pitch of the pinions results in `a morelimited inal movement of the ink pad. The inl( pad swings quickly out of the `way of the descending frame 117 but afterward its extent as well as its speed of movement decreases so that it is not moved any farther to one side of the frame than is necessary.

It is obvious that while. the invention is disclosedin connectionwith a dating stamp, it is applicable to all forms of self-inking hand stamps; the `inlring means may take other form than the pad shown; the printing characters may be mounted otherwise than as shown; and further that the-device will operate with a single rack and pinion. The invention is therefore not restricted to the particular type of hand stamp shown, nor is it, by reason of the principle of operation involved limited to the pitch circle of the pinions being eccentrics, the essential feature being that the radius of the pitch circle is shorter at the initial acting part of the pinion thanat its final part which coacts with the rack.

It is also new7 so far as I am advised.` to provide a hand stamp in which an inking pad is mounted to oscillare about a horizontal axis and is provided with a Series of teeth partially encircling its axis of oscillation and coperating with a rack having a series of teeth carried by the vertically reciprocating frame and engaging the teeth of the inking pad.

I claim:

1. In a self-inking stamp, a frame equipped with printing characters and provided with a rack, ink distributing `means including 'an actuating pinion having a shorter radius, at the active point of initial movement, than at the point of its `iinal movement7 the said rack and pinion engaging each other and operating to impart a quick initial movement and a reduced speed final movement to the inking pad .as itis moved away, from theprinting characters.

2. In a self-'liking stamp, a frame equipped with printing characters and provided with a rack, ink distributing means including an actuating pinion, the pinion having an eccentric pitch line, the rack having a pitch line tangent to the pinion pitch line at the point of contact, the said rack and pinion engaging each other `andoperating to determine the movement of said ink distributing means.

3. In a self-hiking stamp, a frame equipped with printing characters,' a rack having a pitch line `slanting with `respect to the line of movement of the frame, guiding studs for the rack whereby it ,may be positioned upon the frame, inlrdistributing means including an actuating pinion, the .said pinion having an eccentric pitchli-ne and meshing Vwith the said rack.

4. In combination, a frame, aV shaft carrying printing drums, screws adapted to attach the shaftto` thefranie,washersfor the screws having an extension forminga rack, the said screws serving Vto bind the said i'ashers and shaft tothe frame.

5. In combination, a frame,V a-.shaft carrying printing d`ru1ns,screws adapted to attach the shaft to the frame, washers for the screws having an extension'. forming a rack, the washers being further equipped with vmeans for positioningthewashers and rracks with respect to the frame, the said screws serving to bind the said washers andshaft to the frame. p

In testimony whereof, I have hereunto subscribed my name. v

JULIUS Witnesses: *Y

HELEN M. LownRY, MARTHA .S'roLz.

missiva.

Cc'pea of this patent may be obtained for ve cents each, Vby addressing the Commissioner of'latents, Washington, D. C. 

